What Is an Air Duct?

Air duct is a duct system used for air transportation and distribution. There are two types of composite duct and inorganic duct. Compound duct is represented by Durkduct duct. Can be classified according to cross-sectional shape and material. Air duct manufacturing Stainless steel duct is made by applying sealant (such as neutral glass glue) to the gaps such as the seam, rivet seam, flange flange and four corners. Remove dust and oil on the surface before applying sealant. According to the cross-sectional shape, the air duct can be divided into a variety of circular ducts, rectangular ducts, oblate ducts, etc. Among them, the circular ducts have the smallest resistance but the largest height dimension, and the production is complicated. So the application is mainly rectangular duct. According to the material, the air duct can be divided into metal air duct, composite air duct and polymer air duct.

Among them, metal ducts are ducts made of various metal materials, and commonly used include galvanized iron and stainless steel. With the current storage tank

Reduce leakage. The installation of the spiral duct significantly reduces the connection points between the tube and the pipe, and minimizes leakage at the joints of the pipe. The typical spiral duct length is 3 ~ 6m, while the length of a typical rectangular duct is only 1 ~ 1.5m; and only one pipe connection is needed to connect two spiral ducts, while the traditional rectangular ducts often require a completely independent double

Lightweight, high hardness, durable aluminum foil composite extruded air-conditioning insulation board, the interior is independent

The common plate type flanged air duct is also called non-blue duct, and its production form is faster, more convenient and smaller than the traditional rectangular duct.

1. Beautiful appearance Modified inorganic glass fiber reinforced plastic ventilation duct adopts a unique formula and is different from the traditional production process, so that the product has a beautiful appearance, which is incomparable with traditional iron glass duct and polyester fiberglass duct. of. 2. Excellent non-combustibility Modified inorganic glass fiber reinforced plastic air duct is composed of a variety of inorganic materials and medium-alkali reinforced glass fiber mesh cloth. The combustion performance is rated as A by the National Construction Engineering Quality Supervision and Inspection Center. 3. The fire resistance is not less than 90 minutes as tested by the National Construction Engineering Quality Supervision and Inspection Center. ^[1]

Magnesium oxychloride ventilation duct (also referred to as modified inorganic glass fiber reinforced plastic ventilation duct) is a new generation of environmental protection and energy saving duct that replaces iron duct and fiberglass duct. Whether in production, production, installation, or in the process of plant decoration, it will not produce environmentally harmful substances, no rust, no mold, no dust accumulation, no glass fiber dust and fiber, no odor; thermal conductivity Low coefficient, excellent insulation performance; good

1. The extruded air-conditioning insulation board will not be decomposed and mildewed, and no harmful substances are volatilized. 2. Chemical stability and stable quality ^[1]

Adopting insulation duct material, which can be installed and manufactured at the construction site, only simple and dedicated

Extruded heat insulation duct products are suitable for the installation of air conditioning and ventilation engineering in industry and various buildings, and are widely used in food processing, machinery manufacturing, pharmaceutical products, electronics industry, shopping malls, cotton textiles, sports and entertainment venues, hotels, and hotels , Supermarkets, office buildings, government agencies, small villas, family homes, aerospace manufacturing and other fields. ^[1]

GB 50243-2002 "Code for Construction Quality Acceptance of Ventilation and Air Conditioning Engineering"

JGJ141-2004 "Ventilation Pipe Technical Regulations"

JG / T258-2009 "Non-metal and composite air duct"

1.1.1 Application

This construction process standard is applicable to the processing and production of metal, non-metallic ducts and composite ducts or ducts used in ventilation and air conditioning projects of construction projects.
1.1.2 Preparation of reference standards and specifications

(1) National Standard of the People's Republic of China "Code for Construction Quality Acceptance of Ventilation and Air Conditioning Engineering" (GB 50243-2002)
(2) National Standard of the People's Republic of China "Uniform Standard for Construction Quality Acceptance of Construction and Installation Engineering" (GB 50300-2001)
1.2 Terminology ^[1]

(1) Inspection lot: A test body composed of a certain number of samples, which is collected for inspection according to the same production conditions or in a prescribed manner.

(2) Inspection: activities performed by measuring, inspecting, testing, etc. the performance of the inspection items, and comparing the results with the requirements of the standard to determine whether each performance is qualified.
(3) Handover inspection: An activity undertaken by the contractor and the completion party of the construction to check and confirm whether construction can be continued.
(4) Main control items: Inspection items that play a decisive role in safety, health, environmental protection and public interest in construction projects.
(5) General items: Inspection items other than the main control items.
(6) Sampling inspection: According to the prescribed sampling plan, random inspection shall be conducted by taking a certain number of samples from the incoming materials, structural parts, equipment or construction engineering inspection items according to the inspection lot.
(7) Air duct: Pipes made of metal, non-metallic sheet or other materials for air circulation.
(8) Air duct: It is made of concrete, brick and other building materials and used for air circulation.
(9) Ventilation engineering: collectively referred to as air supply, exhaust, dust removal, pneumatic conveyance, and anti-fume system.
(10) Air-conditioning project: a general term for air conditioning, air purification, and clean air-conditioning systems.
(11) Bite: The structure where the edges of the metal sheet are bent into a certain shape and used for fixed connection to each other.
(12) Air leakage volume: The volume of air leaked or infiltrated through the air duct body structure and its interface under a certain static pressure in a unit time.
(13) Allowable air leakage of system air duct: According to the average unit area and maximum allowable air leakage per unit time specified by the air duct system category.
(14) Air leakage rate: The ratio of the amount of air infiltration or leakage under the working pressure to the rated air volume of air conditioning equipment, dust collectors, etc.
(15) Purification air conditioning system: Air conditioning and air purification systems for clean spaces.
(16) Light leakage detection: A method of using a strong light source to inspect the light through the mouth, joints, flanges, and other connections of the duct to determine the number of leaks such as holes and gaps.
(17) Working pressure of air duct system: refers to the maximum working pressure designed at the main air duct of the system's air duct.
(18) Air cleanliness level: The classification standard for the unit volume of air in a clean space divided by the maximum concentration limit of particles greater than or equal to the considered particle size.
(19) Corner pieces: Right-angled special members for the four corners of the flanged ducts of thin steel sheet metal.
(20) Non-metallic air duct: Air duct made of non-metallic inorganic materials such as rigid polyvinyl chloride, organic glass fiber reinforced plastic, and inorganic glass steel.
(21) Composite material air duct: An air duct made of a non-combustible material surface layer composite insulation material board.
(22) Fire-resistant air duct: An air duct made of non-combustible and refractory materials that can meet a certain fire resistance limit.